Zhong Wei, Gao Feng, Zou Jin, Liu Shuwu, Li Mingfang, Gao Yansha, Yu Yongfang, Wang Xiaoqiang, Lu Limin
Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Key Laboratory of Chemical Utilization of Plant Resources of Nanchang, College of Science, Jiangxi Agricultural University, Nanchang 330045, PR China.
Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Key Laboratory of Chemical Utilization of Plant Resources of Nanchang, College of Science, Jiangxi Agricultural University, Nanchang 330045, PR China.
Food Chem. 2021 Oct 30;360:130006. doi: 10.1016/j.foodchem.2021.130006. Epub 2021 May 4.
In this paper, a novel ratiometric electrochemical sensor for carbendazim (CBZ) detection was constructed by a composite of MXene@Ag nanoclusters and amino-functionalized multi-walled carbon nanotubes (MXene@AgNCs/NH-MWCNTs). The Ag nanoclusters (AgNCs) embedded in the MXene not only could inhibit the aggregation of MXene flakes and enhance the electrocatalytic ability, but also serve as an internal reference probe for the ratiometric electrochemical detection. Moreover, the introduction of NH-MWCNTs can further improve the electrochemical signals of CBZ and Ag, resulting in the enhanced signal amplification and higher sensitivity. Based on these characteristics of the MXene@AgNCs/NH-MWCNTs composite, the proposed sensor exhibits a favorable linear relationship between I/I and the concentration of CBZ ranging from 0.3 nM to 10 μM and a low limit of detection of 0.1 nM. Moreover, the proposed ratiometric electrochemical sensing platform also demonstrates high selectivity, good reproducibility, secular stability, and satisfactory applicability in vegetable samples.
本文通过MXene@Ag纳米团簇与氨基功能化多壁碳纳米管（MXene@AgNCs/NH-MWCNTs）的复合材料构建了一种用于多菌灵（CBZ）检测的新型比率电化学传感器。嵌入MXene中的银纳米团簇（AgNCs）不仅可以抑制MXene薄片的聚集并增强电催化能力，还可以作为比率电化学检测的内部参考探针。此外，NH-MWCNTs的引入可以进一步改善CBZ和Ag的电化学信号，从而增强信号放大并提高灵敏度。基于MXene@AgNCs/NH-MWCNTs复合材料的这些特性，所提出的传感器在I/I与浓度范围为0.3 nM至10 μM的CBZ之间表现出良好的线性关系，检测限低至0.1 nM。此外，所提出的比率电化学传感平台还具有高选择性、良好的重现性、长期稳定性以及在蔬菜样品中令人满意的适用性。
